package com.example.administrator.handlermessage;

import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {
    ProgressBar bar = null;
    Button startButton = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bar = (ProgressBar)findViewById(R.id.bar);
        startButton = (Button)findViewById(R.id.startButton);
        startButton.setOnClickListener(new ButtonListener());
    }
   class ButtonListener implements View.OnClickListener{
       @Override
       public void onClick(View view) {
           bar.setVisibility(View.VISIBLE);
           Handler updateBarHandler = null;
           updateBarHandler.post(updateThread);
       }
   }
   Handler updateBarHandler = new Handler(){
       @Override
       public void handleMessage(Message msg) {
           bar.setProgress(msg.arg1);
           updateBarHandler.post(updateThread);
       }
   };
   Runnable updateThread = new Runnable() {
       int i = 0;
       @Override
       public void run() {
           System.out.println("Begin Thread");
           i=i+10;
           Message msg = updateBarHandler.obtainMessage();
           msg.arg1 = i;
           try{
               Thread.sleep(1000);
           }
           catch (InterruptedException e){
               e.printStackTrace();
           }
           updateBarHandler.sendMessage(msg);
           if(i == 100){
               updateBarHandler.removeCallbacks(updateThread);
           }
       }
   };
}
